Eraser.



B. B. GOLDSMITH.

ERASER. APPLICATION FILEDMAR. 8, lslz.

1 1 89,937. Patented July 4,1916.

67M /3 {a/MJ# SWW/who@ BYRON B. GOLDSMITI-I, 0F NEW YORK, N. Y.

ERASER.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed March 8, 1912. Serial No. 682,464.

To all 11s/tom t may concern.'

Be it known that I, BYRON B. GoLDsMrTir, a citizen of the United States, residing at the city of New York, in the county of New York and State of New York, have invented certain new and useful improvements in Erasers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It has been found that for many purposes it is convenient to use rubber erasers, either for ink or pencil, in circular form, and for this purpose disks of appropriate composiytion have been put upon the market. It has been customary hitherto to compress these disks between circular metal plates united through a central aperture and as these have hitherto been made, only a small part of the rubber has been available because, as soon as the rubber is worn down to the edge of the fastening disks, it is not possible to use the remainder.

It is the obj ect of this invention to supply a form of eraser in which substantially the entire mass of the rubber disk is available for the purpose intended. With this end in view, I have contrived the form of eraser shown in two oil its possible embodiments in the accompanying drawings, wherein- Figure 1 shows in cross section the various parts of the eraser about to be assembled, Fig. 2 is a plan view ot the rubber disk without the metal astenings, Fig. 3 is a sectional view of a. modified Jform showing the metal disks separated to form the eraser for the sake of clearness, Fig. 4 is a face view of another moditied form, and Fig. 5 is a sectional view of still another modification within my invention.

An annular disk 10 is provided with two metal fastening disks 11 and 12 applied to the opposite sides of the central opening 13 and arranged to engage the inner edge ot the annular rubber disk. In the form shown in Figs. l and 2 theV rubber disk is supplied with a circular groove 14 preferably on each face as shown and the fastening disks, one or both, have corresponding circular corrugations 15 spun into them, which corrugations tit into the grooves 14, when the disks are applied to opposite sides, as indicated in Fig.

l. When the disks are applied they may be fastened in any desired manner and preferably by a rivet 1G which passes through the central openings shown in the disks 11 and 12, said rivet being turned over in a well known manner.

In Fig. 3 is shown a modification of my construction illustrating the fact that the use of pre-formed grooves in the eraser is not inconsistent with the use -oit sharp edges in the metal plates, intended to beY pressed into the rubber composition. ln this form the edges of the plates 19 and 2O are turned inward toward the eraser, Vso as to be pressed into the soft composition outside ot the holding rims 15. f

As illustrated in Fig. 4, my eraser may be given a contour other than circular, as also the disks 22. This figure also illustrates the use of corrugations 23, of a non-continuous nature as substitutes for the corrugations 15 in the disks; it being understood that the grooves in the eraser body 21 are appropriately shaped to receive the same.

Fig. 4 illustrates the fact that it is not essential to my invention that the retaining corrugations be formed in both disks, but that one disk may be made tlat.

1. An eraser of appropriate yielding composition made in substantially annular form and having afcentral opening covered by metal disks applied to opposite sides ot the eraser, one or both oi said disks being supplied with means near its edges engaging the material of the eraser close to the edge of the central aperture of the annulus, substantially as described.

2. An eraser of appropriate yielding composition made in substantially annular form and having a central opening surrounded by depressions molded in the composition, and metal disks applied to opposite sides ot the eraser, one or both ot said disks having a bent in portion adapted to cooperate with the corresponding depression or depressions for engaging the material ot the eraser and securing said disks, substantially as described. Y

BYRON B. GOLDSMITH. Witnesses:

FRANK Dnnws, F. J. MRAZ.

Copies of thin patent may be obtainecfor vc cents each, by addressing the "Commissioner of Patents.

Washington, D. C. 

